DE102021211861A1 - Battery cell without conductor lugs, vehicle and method for manufacturing a battery cell - Google Patents

Abstract

The present invention relates to a battery cell (1) for a vehicle (2), having a cell housing (3) and an electrode separator assembly (4) arranged inside the cell housing (3), the electrode separator assembly (4) having a plurality of first electrode layers (5) and a plurality second electrode layers (6) which are alternately stacked one on top of the other and are electrically insulated from one another by means of an insulating device (7). The first electrode layers (5) each have an electrically conductive first overhang (8) on a first side in relation to the adjacent second electrode layers (6), the first overhangs (8) being embedded in a first electrically conductive medium (9) and over the first electrical conducting medium (9) are electrically coupled to one another. The invention also relates to a vehicle (2) and a method for producing a generic battery cell (1).

Description

The present invention relates to a battery cell for a vehicle. Furthermore, the invention relates to a vehicle with a generic battery cell and a method for producing a battery cell.

Conventional prismatic cells have an active part that essentially consists of an electrode separator assembly (ESV) in which an electrolyte is arranged. The electrode-separator assembly has a plurality of anode layers and cathode layers, which are combined alternately one above the other to form a stack and are electrically insulated from one another by separator layers. To conduct the electrical current, the anode layers have a common anode conductor, which is usually assembled from a plurality of conductor lugs, each of which extends away from an anode layer. Furthermore, the cathode layers have a common cathode conductor for conducting the electric current, which is usually assembled from a plurality of conductor tabs, each of which extends away from a cathode layer.

To produce prismatic lithium-ion cells, the individual anode conductors of the electrode separator assembly must be welded to one another on the anode side and to a first section, a first housing part of a battery housing of the battery cell, a tab of the battery cell or the like. Likewise, the individual cathode conductors of the electrode separator assembly must be welded to one another on the cathode side and to a second section of the first housing part, another tab of the battery cell or the like. The first housing part is designed, for example, as a housing cover, housing wall or the like.

In order to implement this production process and to reduce the weight of the inactive materials, the contours of the collector lugs must first be cut into the electrodes. This is usually done through a mechanical or photonic process. Then the conductor lugs protruding from the electrode separator assembly must be trimmed in a defined manner and welded together using ultrasound.

These joined elements are in turn welded by means of ultrasound, laser or the like to the respective portion of the first housing part, the tab or the like of the prismatic cells. This is followed by the introduction of the electrode separator assembly into a second housing part of the battery housing, which is designed as a can, for example, and the welding of the first housing part to the second housing part using a laser welding process or the like.

From the document U.S. 2004/0061476 A1 a battery cell is known in which a collector plate is attached to end faces of the electrode layers by means of a welding process. The document U.S. 6,143,442A discloses a prismatic battery cell in which the electrical contacting of an electrode takes place via a contacting with a housing part of the battery cell, while the other electrode also has a conductor lug which is welded to an electrode plate. The document U.S. 10,964,970 B2 shows a battery cell in which the electrode separator assembly has an exposed section on each electrode layer, on which a connection plate is arranged, which is electrically coupled to a connection pole of the battery cell.

Known battery cells have the disadvantage that production is often very complex and error-prone. Cutting an arrester contour, trimming arrester lugs, welding the individual arrester lugs, welding the arrester to a cover assembly and welding the cover assembly to a socket are a large number of processes which can lead to a high reject rate, especially if they are linked. The production of a composite of electrode layers with collector plates welded on at the front is very complex and error-prone, since great precision is required during welding in order to ensure that all the electrode layers are in contact with the collector plate without gaps.

It is therefore the object of the present invention to eliminate or at least partially eliminate the disadvantages described above in a battery cell. In particular, the object of the present invention is to create a battery cell, a vehicle and a method for producing a generic battery cell that improve the production of battery cells in a simple and cost-effective manner and/or avoid manufacturing errors in the production of the battery cells.

The above object is solved by the patent claims. Accordingly, the object is achieved by a battery cell for a vehicle having the features of independent claim 1, by a vehicle having the features of independent claim 9 and by a method for producing a battery cell having the features of independent claim 10. Further features and details of the invention result from the dependent claims, the description and the drawings.

Features and details that are described in connection with the battery cell according to the invention also apply, of course, in connection with the vehicle according to the invention and the method according to the invention, and vice versa, so that the disclosure of the individual aspects of the invention is or can always be referred to alternately.

According to a first aspect of the invention, the object is achieved by a battery cell for a vehicle. The battery cell has a cell housing and an electrode-separator assembly arranged within the cell housing, the electrode-separator assembly having a plurality of first electrode layers and a plurality of second electrode layers which are stacked alternately on top of one another and are electrically insulated from one another by means of an insulating device. According to the invention, the first electrode layers each have an electrically conductive first overhang on a first side compared to the adjacent second electrode layers, the first overhangs being embedded in a first electrically conductive medium and electrically coupled to one another via the first electrically conductive medium.

The battery cell is designed for use in a vehicle, such as a motor vehicle, an aircraft, a watercraft, an underwater vehicle, a spacecraft or the like. This means that the battery cell is particularly suitable for use in a vehicle. Of course, the battery cell according to the invention can be used in a stationary facility, such as a residential building, a laboratory, a power plant, a production hall or the like.

The cell housing is preferably formed from an electrically conductive material or has an electrically conductive material. The cell housing is preferably designed to provide electrical poles for the battery cell, with the electrical poles being electrically insulated from one another. It can be provided according to the invention that one electrical pole or two electrical poles of the battery cell are each realized by an electrical conductor which is insulated from the cell housing. The cell housing preferably has a housing opening for filling in an electrolyte. The cell housing preferably has one or more bursting valves.

The electrode separator assembly is arranged within the cell housing and is protected from external influences by the cell housing. The electrode separator assembly has a plurality of first electrode layers and a plurality of second electrode layers, which are each arranged alternately stacked on top of one another and are electrically insulated from one another by means of an insulating device. Such an insulating device is also referred to as a “separator”. According to the invention, the insulating device can have one or more insulating layers. The electrode separator assembly can therefore be formed as a stack of a plurality of individual first electrode layers, a plurality of individual second electrode layers and a plurality of individual insulator layers which are arranged alternately one above the other such that an insulator layer is arranged between the first electrode layers and the second electrode layers. Alternatively, the electrode separator assembly can also be formed as a winding made of a first electrode layer, a second electrode layer and two insulator layers. According to the invention, the insulator layer can be formed as an additional free layer or as a coating of the first electrode layer and/or the second electrode layer. According to the invention, the first electrode layers can be in the form of anodes. According to the invention, the second electrode layers can be embodied as cathodes. Provision can likewise be made according to the invention for the first electrode layers to be in the form of cathodes and the second electrode layers to be in the form of anodes.

On a first side, the first electrode layers each have an electrically conductive first overhang in relation to the adjacent second electrode layers. The first side is preferably a first end face of the electrode separator assembly. The first projection preferably extends away from the electrode separator assembly in a uniform manner or in a gradual manner. The first projection is preferably formed monolithically with the first electrode layer.

The first projections are embedded in a first electrically conductive medium and electrically coupled to one another via the first electrically conductive medium. The first electrically conductive medium is preferably deformable, in particular plastically deformable. It can be provided according to the invention that the first electrically conductive medium is designed in such a way that the first electrically conductive medium is initially malleable, such as free-flowing, liquid, flowable, in particular viscous, and then solidified, in particular dimensionally stable, during production of the battery cell. The first electrically conductive medium is preferably designed such that such a change in properties through a chemical reaction, dry tion, cooling, heating or the like can be effected. The first electrically conductive medium is preferably designed in such a way that the electrical coupling of the first projections and thus of the first electrode layers is maintained during intended use of the battery cell in order to conduct the current and avoid loose contacts. No electrical coupling is established with the second electrode layers via the first electrically conductive medium. It can be provided according to the invention that a first insulating medium is arranged between the second electrode layers and the first electrically conductive medium. The first insulating medium preferably has a higher melting point than the first electrically conductive medium.

It is preferred according to the invention that the second electrode layers on a second side of the electrode separator assembly opposite the first side each have an electrically conductive second overhang compared to the adjacent first electrode layers. Accordingly, the second side is preferably a second end face of the electrode separator assembly. The second projection preferably extends away from the electrode separator assembly in a uniform manner or in a gradual manner. The second projection is preferably formed monolithically with the second electrode layer.

The second projections are embedded in a second electrically conductive medium and electrically coupled to one another via the second electrically conductive medium. The second electrically conductive medium is preferably deformable, in particular plastically deformable. It can be provided according to the invention that the second electrically conductive medium is designed in such a way that the second electrically conductive medium is initially malleable, such as free-flowing, liquid, flowable, in particular viscous, and then solidified, in particular dimensionally stable, during production of the battery cell. The second electrically conductive medium is preferably designed such that such a change in properties can be brought about by a chemical reaction, drying, cooling, heating or the like. The second electrically conductive medium is preferably designed in such a way that the electrical coupling of the second projections and thus of the second electrode layers is maintained during intended use of the battery cell in order to conduct the current and avoid loose contacts. The second electrically conductive medium preferably has the same material as the first electrically conductive medium or is formed from the same material. No electrical coupling is established with the first electrode layers via the second electrically conductive medium. It can be provided according to the invention that a second insulating medium is arranged between the first electrode layers and the second electrically conductive medium. The second insulating medium preferably has a higher melting point than the second electrically conductive medium.

A battery cell according to the invention has the advantage over conventional battery cells that the first electrode layers are electrically coupled to a first pole of the battery cell using simple means and in a cost-effective manner. The first projections and the first electrically conductive medium electrically couple the first electrode layers to the first pole of the battery cell in a simple manner. Conductor lugs and tabs are therefore unnecessary in the battery cell, so that the error-prone work steps of cutting the conductor lugs, welding the conductor lugs to form a conductor, and welding the conductor to the tab and to the cell housing are not required. In this way, process reliability in the manufacture of the battery cell is improved. In addition, manufacturing tolerances of components of the battery cell can be easily compensated for by the formability of the first electrically conductive medium. Finally, the battery cell according to the invention has reduced manufacturing costs and improved space utilization.

According to a preferred further development of the invention, it can be provided in a battery cell that the first electrically conductive medium has a duroplastic and/or a thermoplastic and/or an adhesive and/or a soldering paste. Such materials have particularly good formability and processability. The first electrically conductive medium preferably has a melting point that is higher than an upper operating temperature of the battery cell, for example during rapid charging and an ambient temperature of 40° C., so that electrical coupling of the first electrode layers is ensured even if the battery cell heats up to a relatively high degree. Any second electrical conducting medium that may be present is preferably configured in the same way. This has the advantage that reliable electrical coupling of the first electrode layers is ensured with simple means and in a cost-effective manner, and this coupling is maintained even at higher operating temperatures of the battery cell when used as intended.

It is preferred according to the invention that the first electrically conductive medium has a material which, below a predefined limit temperature, which limits a just acceptable upper operating temperature of the battery cell, has a non-flowable state and is in a free-flowing state above the limit temperature.

A still acceptable upper operating temperature of the battery cell is a temperature at which further operation of the battery cell is possible without the battery cell suffering irreversible damage that is greater than a predefined tolerable wear. Above the predefined limit temperature, a complete or partial shutdown of the battery cell is advantageous in order to protect the battery cell from excessive irreversible damage. The cell housing preferably has a free space for accommodating the first electrically conductive medium that has flowed out. The first electrically conductive medium is preferably designed and set up to flow off above the upper operating temperature in such a way that the electrical coupling to one or more first electrode layers is thereby eliminated. Any second electrical conducting medium that may be present is preferably configured in the same way. This has the advantage that excessive damage to the battery cell, such as thermal runaway, can be prevented or at least limited using simple means and in a cost-effective manner. Thus, for example, igniting the battery cell can be avoided.

More preferably, the cell housing has an electrically conductive first cell housing part and a second cell housing part that is electrically insulated from the first cell housing part, the first electrode layers being electrically coupled to the first cell housing part via the first projections and the first electrically conductive medium. The second electrode layers are preferably electrically coupled to the second cell housing part via the second projections and the second electrically conductive medium. The cell housing is preferably designed in such a way that, when assembled, the first cell housing part and the second cell housing part look the same size. Accordingly, a positive pole and a negative pole of the battery cell are the same size. This has the advantage that a battery cell with a cell housing, through which the electrical poles of the battery cell are formed, is provided with simple means and in a cost-effective manner. Such a battery cell can easily be combined with other battery cells to form a series circuit and a parallel circuit.

In a particularly preferred embodiment of the invention, the first cell housing part and the second cell housing part have a common overlapping area. It is preferred that in the overlapping area the first cell housing part is inserted into the second cell housing part or the second cell housing part is inserted into the first cell housing part. Electrical insulation is preferably arranged in the overlapping area in such a way that the first cell housing part is electrically insulated from the second cell housing part. The electrical insulation is preferably designed to prevent the first cell housing part from touching the second cell housing part. As an alternative to an overlapping area, a mechanical coupling between the first cell housing part and the second cell housing part can be realized, for example, by an electrically insulating coupling device, such as a socket or the like. The first cell housing part and the second cell housing part preferably have a press fit in the overlapping area. This has the advantage that a cell housing with two electrical poles is provided with simple means and in a cost-effective manner.

The electrode separator assembly is preferably designed as a cylindrical coil, a prismatic flat coil or a stack of layers. A cylindrical coil extends about a coil axis and has a helical cross-section. The layers are designed as endless layers. A flat coil has two winding axes arranged at a distance from one another and a flat region formed between the winding axes. In the area of the winding axes, the individual layers are preferably bent over by 180°. In the flat area, the individual layers are preferably plate-shaped and arranged parallel to one another. The layers are designed as endless layers. In a layer stack, the layers are arranged parallel to one another and are designed as separate individual layers that are stacked on top of one another. This has the advantage that the battery cell can be produced using simple means and in a cost-effective manner.

According to a preferred embodiment of the invention, the first projection has a length of less than 5 mm. This means that the first overhang extends less than 5 mm away from the second electrode layer. The first projection preferably has a length of less than 1 mm. It is preferred according to the invention that the first projection has a length of at least 0.1 mm. Accordingly, it is preferred that the second overhang has a length of less than 5 mm, particularly preferably less than 1 mm. More preferably, the second overhang has a length of at least 0.1 mm. This has the advantage that a space-saving and reliable electrical coupling of the electrode layers is provided with simple means and in a cost-effective manner.

The first overhang particularly preferably extends over at least 50% of a layer width of the first electrode layer. More preferably, the first overhang extends over the entire width of the layer or at least essentially over the entire width of the first electrode layer. The extent of the first projection in the direction of the layer width of the first electrode layer should be selected to be as large as possible in order to achieve the best possible quality of the electrical coupling with the first electrically conductive medium. The second overhang preferably extends over at least 50% of a layer width of the second electrode layer. More preferably, the second overhang extends over the entire width of the layer or at least essentially over the entire width of the second electrode layer. The extent of the second projection in the direction of the layer width of the second electrode layer should be selected to be as large as possible in order to achieve the best possible quality of the electrical coupling with the second electrically conductive medium. This has the advantage that an electrical coupling between the first electrode layer and the first electrically conductive medium is improved with simple means and in a cost-effective manner.

According to a second aspect of the invention, the object is achieved by a vehicle. The vehicle has an electric drive system with an electric motor. According to the invention, the electric drive system has one or more battery cells according to the invention. The battery cells are preferably arranged in a battery housing of the electric drive system. The cell housings of the battery cells preferably each have an electrical positive pole and an electrical negative pole. The battery cells are preferably electrically connected to one another by contacting the cell housings of adjacent battery cells, for example in a series connection and/or parallel connection.

All the advantages that have already been described for a battery cell according to the first aspect of the invention result from the vehicle according to the invention. Accordingly, the vehicle according to the invention has the advantage over conventional vehicles that the first electrode layers are electrically coupled to a first pole of the battery cell using simple means and in a cost-effective manner. The first projections and the first electrically conductive medium electrically couple the first electrode layers to the first pole of the battery cell in a simple manner. Conductor lugs are therefore unnecessary in the battery cell, so that the error-prone work steps of cutting the conductor lugs, welding the conductor lugs to form a conductor, and welding the conductor to the cell housing are not required. In this way, process reliability in the production of the battery cells is improved. In addition, manufacturing tolerances of components of the battery cell can be easily compensated for by the formability of the first electrically conductive medium. Finally, the vehicle according to the invention has reduced production costs and improved space utilization.

• - Bereitstellen eines Elektrodenseparatorverbunds aus mehreren ersten Elektrodenschichten und mehreren zweiten Elektrodenschichten, die jeweils abwechselnd übereinander gestapelt angeordnet sowie mittels einer Isoliervorrichtung voneinander elektrisch isoliert sind, wobei die ersten Elektrodenschichten auf einer ersten Seite des Elektrodenseparatorverbunds jeweils einen elektrisch leitenden ersten Überstand gegenüber den benachbarten zweiten Elektrodenschichten aufweisen, und wobei die zweiten Elektrodenschichten auf einer der ersten Seite entgegengesetzten zweiten Seite des Elektrodenseparatorverbunds jeweils einen elektrisch leitenden zweiten Überstand gegenüber den benachbarten ersten Elektrodenschichten aufweisen
• - Bereitstellen eines elektrisch leitfähigen ersten Zellgehäuseteils,
• - Anordnen eines formbaren ersten elektrischen Leitmediums im ersten Zellgehäuseteil und/oder an den ersten Überständen,
• - Einfügen des Elektrodenseparatorverbunds in das erste Zellgehäuseteil derart, dass die ersten Überstände über das erste elektrische Leitmedium mit dem ersten Zellgehäuseteil elektrisch gekoppelt werden,
• - Bereitstellen eines elektrisch leitfähigen zweiten Zellgehäuseteils,
• - Anordnen eines formbaren zweiten elektrischen Leitmediums im zweiten Zellgehäuseteil und/oder an den zweiten Überständen, und
• - Zusammenfügen des ersten Zellgehäuseteils mit dem zweiten Zellgehäuseteil derart, dass zweite Überstände der zweiten Elektrodenschichten über das zweite elektrische Leitmedium mit dem zweiten Zellgehäuseteil elektrisch gekoppelt werden, und dass das erste Zellgehäuseteil gegenüber dem zweiten Zellgehäuseteil elektrisch isoliert ist.

According to a third aspect of the invention, the object is achieved by a method for producing a battery cell. The procedure has the following steps:

• - Provision of an electrode separator composite of a plurality of first electrode layers and a plurality of second electrode layers, which are each arranged alternately stacked on top of one another and are electrically insulated from one another by means of an insulating device, the first electrode layers on a first side of the electrode separator composite each having an electrically conductive first overhang compared to the adjacent second electrode layers , and wherein the second electrode layers each have an electrically conductive second overhang in relation to the adjacent first electrode layers on a second side of the electrode separator assembly opposite the first side
• - providing an electrically conductive first cell housing part,
• - arranging a malleable first electrical conducting medium in the first cell housing part and/or on the first projections,
• - Inserting the electrode separator assembly into the first cell housing part in such a way that the first projections are electrically coupled to the first cell housing part via the first electrically conductive medium,
• - providing an electrically conductive second cell housing part,
• - arranging a formable second electrical conducting medium in the second cell housing part and/or on the second projections, and
• - Joining the first cell housing part with the second cell housing part in such a way that second projections of the second electrode layers are electrically coupled to the second cell housing part via the second electrically conductive medium, and that the first cell housing part is electrically insulated from the second cell housing part.

The electrode separator assembly has the first overhangs of the first electrode layers on the first side. The electrode separator assembly has the second overhangs of the second electrode layers on the second side. The first projections are electrically coupled to one another and to the first cell housing part by means of the first electrically conductive medium. The second projections are electrically coupled to one another and to the second cell housing part by means of the second electrically conductive medium. In this case, the first cell housing part and the second cell housing part are joined together in such a way that the first cell housing part and the second cell housing part are electrically insulated from one another.

All the advantages that have already been described for a battery cell according to the first aspect of the invention and for a vehicle according to the second aspect of the invention result from the method according to the invention. Accordingly, the method according to the invention has the advantage over conventional methods that a battery cell which has an electrical coupling of the first electrode layers to a first cell housing part can be produced using simple means and in a cost-effective manner. The first electrode layers are electrically coupled to the first cell housing part of the battery cell in a simple manner by the first projections and the first electrically conductive medium. Conductor lugs are therefore unnecessary in the battery cell, so that the error-prone work steps of cutting the conductor lugs, welding the conductor lugs to form a conductor, and welding the conductor to the cell housing are not required. In this way, process reliability in the production of the battery cells is improved. In addition, manufacturing tolerances of components of the battery cell can be easily compensated for by the formability of the first electrically conductive medium. Finally, a more cost-effective battery cell can be produced by means of the method according to the invention, which has an improved utilization of installation space.

• 1 in einer Draufsicht einen Elektrodenseparatorverbund gemäß einer bevorzugten Ausführungsform der Erfindung,
• 2 in einer Seitenansicht der Elektrodenseparatorverbund aus 1,
• 3 in einer Schnittdarstellung eine Batteriezelle gemäß einer bevorzugten Ausführungsform der Erfindung,
• 4 in einer Seitenansicht eine bevorzugte Ausführungsform eines erfindungsgemäßen Fahrzeugs, und
• 5 in einem Ablaufdiagramm eine bevorzugte Ausführungsform eines erfindungsgemäßen Verfahrens.

A battery cell according to the invention, a vehicle according to the invention and a method according to the invention are explained in more detail below with reference to drawings. They each show schematically:

• 1 in a plan view an electrode separator composite according to a preferred embodiment of the invention,
• 2 in a side view of the electrode separator assembly 1 ,
• 3 in a sectional view, a battery cell according to a preferred embodiment of the invention,
• 4 in a side view a preferred embodiment of a vehicle according to the invention, and
• 5 in a flow chart a preferred embodiment of a method according to the invention.

Elements with the same function and mode of action are in the 1 until 6 each provided with the same reference numerals.

In 1 an electrode separator assembly 4 according to a preferred embodiment of the invention is shown schematically in a plan view. An upper insulating layer of an insulating device 7 of the electrode separator assembly 4 is shown in this representation. A first overhang 8 of a first electrode layer 5 extends away from the electrode separator assembly 4 on a first side of the electrode separator assembly 4 . Only the first overhang 8 of the first electrode layer 5 can be seen in this figure. A second overhang 13 of a second electrode layer 6 extends away from the electrode separator assembly 4 on a second side of the electrode separator assembly 4 opposite the first side. Only the second overhang 13 of the second electrode layer 6 can be seen in this figure.

2 shows the electrode separator assembly 4 1 schematic in a side view. In this representation it can be seen that the electrode separator assembly 4 has a plurality of first electrode layers 5 and a plurality of second electrode layers 6 which are arranged alternately one above the other and are each electrically insulated from one another by an insulating layer of the insulating device 7 . The first electrode layers 5 each have a first overhang 8 which extends away from the electrode separator assembly 4 . The first projection 8 is preferably formed by a first collector, such as a copper collector, of the first electrode layer 5 extending out of a first electrode coating, such as an anode coating, of the first electrode layer 5 . The second electrode layers 6 each have a second overhang 13 which extends away from the electrode separator assembly 4 in the opposite direction. The second overhang 13 is preferably formed by a second collector, such as an aluminum collector, which extends out of a second electrode coating, such as a cathode coating, of the second electrode layer 6 . The insulating device 7 has a larger overhang at the side than the first electrode coating and the second electrode coating. The first supernatant 8 and the second supernatant 13 protrude beyond the isolating device 7 laterally.

In 3 a battery cell 1 according to a preferred embodiment of the invention is shown schematically in a sectional view. The battery cell 1 has the in 2 electrode separator assembly 4 shown. Furthermore, the battery cell 1 has a cell housing 3 with a first cell housing part 3a and a second cell housing part 3b, which are plugged into one another in an overlapping area 10 and are electrically insulated from one another by means of electrical insulation 15 . The first projections 8 are embedded in a first electrically conductive medium 9 and electrically coupled to one another and to the first cell housing part 3a via the first electrically conductive medium 9 . The second electrode layers 6 are electrically insulated from the first electrically conductive medium 9 . The second projections 13 are embedded in a second electrically conductive medium 14 and electrically coupled to one another and to the second cell housing part 3b via the second electrically conductive medium 14 . The first electrode layers 5 are electrically insulated from the second electrically conductive medium 14 . In this embodiment, the first cell housing part 3a is designed, for example, as an anode and the second cell housing part 3b as a cathode of the battery cell 1, or vice versa.

4 shows a preferred embodiment of a vehicle 2 according to the invention schematically in a side view. The vehicle 2 is embodied as a motor vehicle and has an electric drive system 11 with an electric motor 12 , a transmission 16 and a control device 17 for controlling the electric motor 12 . Furthermore, the electric drive system 11 has a battery housing 18 in which several battery cells 1 according to the invention are arranged and electrically connected to one another by mutual contact.

In 5 a preferred embodiment of a method according to the invention is shown schematically in a flowchart. In a first method step 100, the in 1 and 2 illustrated electrode separator assembly 4 is provided. In a second method step 200, the in 3 illustrated electrically conductive first cell housing part 3a provided. In a third method step 300, the in 3 shown malleable first electrical conducting medium 9 in the first cell housing part 3a in an area provided for the first projections 8 and/or directly on the first projections 8 . In a fourth method step 400, the electrode separator assembly 4 is inserted into the first cell housing part 3a in such a way that the first projections 8 are electrically coupled to the first cell housing part 3a via the first electrically conductive medium 9 . In a fifth method step 500, the in 3 illustrated electrically conductive second cell housing part 3b provided. In a sixth method step 600, the 3 illustrated malleable second electrical conductive medium 14 in the second cell housing part 3b in an area provided for the second projections 13 and / or arranged directly on the second projections 13. In a seventh method step 700, the first cell housing part 3a and the second cell housing part 3b are joined together in such a way that the second projections 13 of the second electrode layers 6 are electrically coupled to the second cell housing part 3b via the second electrically conductive medium 14, and that the first cell housing part 3a opposite the second cell housing part 3b, in particular via the in 3 shown electrical insulation 15, is electrically isolated.

Reference List

1

battery cell

2

vehicle

3

cell case

3a

first cell housing part

3b

second cell housing part

4

Electrode Separator Composite

5

first electrode layer

6

second electrode layer

7

isolation device

8th

first overhang

9

first electrical conducting medium

10

overlap area

11

electric drive system

12

electric motor

13

second supernatant

14

second electrical conductive medium

15

electrical insulation

16

transmission

17

control device

18

battery case

100

first step in the process

200

second process step

300

third step

400

fourth step

500

fifth step

600

sixth step

700

seventh step

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• US 2004/0061476 A1 [0006]
• US6143442A [0006]
• US10964970B2 [0006]

Claims (10)

Battery cell (1) for a vehicle (2), having a cell housing (3) and an electrode separator assembly (4) arranged inside the cell housing (3), the electrode separator assembly (4) having a plurality of first electrode layers (5) and a plurality of second electrode layers (6) which are each arranged alternately stacked on top of one another and are electrically insulated from one another by means of an insulating device (7), characterized in that the first electrode layers (5) each have an electrically conductive first overhang (8) on a first side in relation to the adjacent second electrode layers (6) have, wherein the first projections (8) are embedded in a first electrically conductive medium (9) and electrically coupled to one another via the first electrically conductive medium (9). Battery cell (1) after claim 1 , characterized in that the first electrically conductive medium (9) comprises a duroplastic and/or a thermoplastic and/or an adhesive and/or a soldering paste. Battery cell (1) after claim 2 , characterized in that the first electrically conductive medium (9) has a material which is non-flowable below a predefined limit temperature, which limits a just acceptable upper operating temperature of the battery cell (1) and above the limit temperature has a flowable condition . Battery cell (1) according to one of the preceding claims, characterized in that the cell housing (3) has an electrically conductive first cell housing part (3a) and a second cell housing part (3b) which is electrically insulated from the first cell housing part (3a), the first electrode layers ( 5) are electrically coupled to the first cell housing part (3a) via the first projections (8) and the first electrically conductive medium (9). Battery cell (1) after claim 4 , characterized in that the first cell housing part (3a) and the second cell housing part (3b) have a common overlapping area (10). Battery cell (1) according to one of the preceding claims, characterized in that the electrode separator assembly (4) is designed as a cylindrical coil, prismatic flat coil or stack of layers. Battery cell (1) according to one of the preceding claims, characterized in that the first projection (8) has a length of less than 5 mm. Battery cell (1) according to one of the preceding claims, characterized in that the first overhang (8) extends over at least 50% of a layer width of the first electrode layer (5). Vehicle (2) having an electric drive system (11) with an electric motor (12), characterized in that the electric drive system (11) has one or more battery cells (1) according to one of the preceding claims. Method for producing a battery cell (1), having the following steps: - Providing an electrode separator composite (4) from a plurality of first electrode layers (5) and a plurality of second electrode layers (6), which are each arranged alternately stacked on top of one another and are electrically insulated from one another by means of an insulating device (7), the first electrode layers (5) being on a first side of the electrode-separator assembly (4) each have an electrically conductive first overhang (8) in relation to the adjacent second electrode layers (6), and wherein the second electrode layers (6) each have an electrically conductive one on a second side of the electrode-separator assembly (4) opposite the first side have a second overhang (13) compared to the adjacent first electrode layers (5), - providing an electrically conductive first cell housing part (3a), - arranging a malleable first electrical conducting medium (9) in the first cell housing part (3a) and/or on the first projections (8), - Inserting the electrode separator assembly (4) into the first cell housing part (3a) in such a way that the first projections (8) are electrically coupled to the first cell housing part (3a) via the first electrically conductive medium (9), - providing an electrically conductive second cell housing part (3b), - arranging a moldable second electrical conducting medium (14) in the second cell housing part (3b) and/or on the second projections (13), and - Joining the first cell housing part (3a) with the second cell housing part (3b) in such a way that the second projections (13) of the second electrode layers (6) are electrically coupled to the second cell housing part (3b) via the second electrically conductive medium (14), and that the first cell housing part (3a) is electrically insulated from the second cell housing part (3b).

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